ELDT - Entry Level Driver Training Hazard Perception Questions and Answers 2 — Questions and Answers
Question 1: What is the 'see-think-act' concept in hazard perception for CDL drivers?
- A brake testing procedure
- A systematic approach to identifying hazards, evaluating risk, and taking appropriate action (Correct answer)
- A method for reading road signs
- A technique for backing up
Correct answer: A systematic approach to identifying hazards, evaluating risk, and taking appropriate action
See-think-act is a systematic hazard management approach: see the hazard, think about the risk it presents, and act to avoid or minimize the danger.
The see-think-act model is fundamental to defensive driving for CMV operators. 'See' means actively scanning the road environment up to 12-15 seconds ahead, checking mirrors every 5-8 seconds, and maintaining awareness of blind spots. 'Think' means evaluating what the identified hazard could do - predicting the actions of other drivers, pedestrians, or developing conditions. 'Act' means executing the safest response, whether that is adjusting speed, changing lanes, increasing following distance, or stopping. This systematic approach prevents the panic reactions that cause crashes.
Question 2: When scanning the road ahead, how far ahead should a CMV driver look in a highway driving environment?
- About 5 seconds ahead
- About 8 seconds ahead
- At least 12 to 15 seconds ahead (Correct answer)
- About 30 seconds ahead
Correct answer: At least 12 to 15 seconds ahead
CMV drivers should scan at least 12 to 15 seconds ahead on highways, which equates to about a quarter mile at highway speeds, to provide adequate time to identify and respond to hazards.
Looking 12-15 seconds ahead at highway speed (approximately 1,300-1,600 feet or a quarter mile) gives the driver sufficient time to identify developing hazards and plan a response. CMVs need more lead time than passenger vehicles because of their longer stopping distances and limited maneuverability. In city driving, the scanning distance is reduced to about 1 to 1.5 blocks or 8-10 seconds. Drivers should not fixate on any one point but should keep their eyes moving in a systematic scanning pattern.
Question 3: What is a 'stale green light' and why is it a hazard?
- A malfunctioning traffic signal
- A green light that has been green for a while and may change to yellow soon (Correct answer)
- A green light covered in algae
- A green light at an uncontrolled intersection
Correct answer: A green light that has been green for a while and may change to yellow soon
A stale green light is one that has been green for an unknown amount of time and may be about to change. CMV drivers should prepare to stop because they cannot stop as quickly as smaller vehicles.
A stale green light is a traffic signal that is green when you first see it, meaning you do not know how long it has been green and it could turn yellow at any moment. This is particularly hazardous for CMVs because their longer stopping distances mean they may not be able to stop safely if the light changes to yellow when they are in the dilemma zone - too close to stop but too far to clear the intersection before it turns red. CDL drivers should cover the brake when approaching a stale green light and be prepared for it to change.
Question 4: Why are railroad crossings particularly dangerous for CMV drivers?
- Trains always have the right of way and CMVs have long stopping distances (Correct answer)
- Railroad tracks damage CMV tires
- Train signals are unreliable
- Trains move too slowly to be a hazard
Correct answer: Trains always have the right of way and CMVs have long stopping distances
Trains always have the right of way, cannot stop quickly, and CMVs need significantly more time and distance to clear crossings due to their length and slower acceleration.
Railroad crossings are high-risk for CMVs for several reasons: trains always have the right of way and a loaded freight train can take over a mile to stop; CMVs need significant time to clear crossings due to their length (53-foot trailer takes 14+ seconds to cross); some crossings have steep approaches where low-clearance vehicles can get stuck on the tracks; and some crossings have no active warning signals. Federal regulations require certain CMVs (buses, hazmat, and others) to stop at all railroad crossings regardless of signals. Drivers must never shift gears while crossing tracks.
Question 5: What should you look for when approaching a curve as a hazard perception practice?
- Only the posted speed limit sign
- Road surface conditions, banking, advisory speed signs, and potential oncoming traffic (Correct answer)
- Other vehicles behind you
- The curve's scenic view
Correct answer: Road surface conditions, banking, advisory speed signs, and potential oncoming traffic
When approaching a curve, scan for road surface conditions, the degree of banking, advisory speed signs, sight distance limitations, and the potential for oncoming traffic crossing the center line.
Effective hazard perception before a curve involves evaluating multiple factors: advisory speed signs (yellow diamond signs showing recommended curve speed, which are set for passenger vehicles and may need further reduction for CMVs); road surface conditions (wet, icy, or gravel reduce traction); the degree of road banking (superelevation helps counteract centrifugal force); sight distance through the curve; potential for oncoming vehicles crossing the center line; and debris or stopped vehicles hidden by the curve. CMVs with high centers of gravity should take curves slower than posted advisory speeds.
Question 6: What is the 'Smith System' for defensive driving?
- A vehicle maintenance schedule
- Five principles for safe space management and hazard avoidance (Correct answer)
- A CDL test preparation course
- A method for loading cargo
Correct answer: Five principles for safe space management and hazard avoidance
The Smith System consists of five defensive driving principles: aim high in steering, get the big picture, keep your eyes moving, leave yourself an out, and make sure they see you.
The Smith System is a widely-used defensive driving methodology with five key principles: (1) Aim High in Steering - look far ahead, not just at the vehicle in front; (2) Get the Big Picture - maintain awareness of the entire traffic scene around you; (3) Keep Your Eyes Moving - scan mirrors, instruments, and the road constantly; (4) Leave Yourself an Out - always maintain an escape route; (5) Make Sure They See You - use signals, lights, and horn to communicate your presence. These principles help CMV drivers anticipate hazards and maintain safe space cushions around their vehicles.
ELDT - Entry Level Driver Training Hazard Perception Questions and Answers 2
What is the 'see-think-act' concept in hazard perception for CDL drivers?